Looking for advice in disaster preparation - Veritas

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My boss: "if the office burns down, we should be able to be up and running
in no less than 4 hours"
Me: "Dammit!"
This means we need an alternate location with servers in a network ready to
go.
...

Looking for advice in disaster preparation

My boss: "if the office burns down, we should be able to be up and running
in no less than 4 hours"
Me: "Dammit!"

This means we need an alternate location with servers in a network ready to
go.
The challenge here is to find the best solution. And I am very close to be a
rookie in this matter.

Anyone who have done this before? One big question is how to replicate our
network with the software to a new one, on (mostly) different type of
hardware. Previous postings tells me this is not an easy task.

Someone suggested using DFS and VPN, but how will that work with AD, SQL
databases, Exchange mailboxes and so on? Another one is to set up a similar
environment, and run a restore. Files is not a problem. But I suppose there
are several challenges according to system state. How about the registry?
partitions and shares?